DKFL 5303 2RS C3 Angular Contact Ball Bearing
The 5303 2RS C3 bearing from the renowned industrial brand DKFL represents one of the most rugged and heavy-duty double-row angular contact solutions available for 17 mm shaft assemblies. Unlike the lighter 52 series, this component belongs to the 53 Heavy Series (DIN 33xx), characterized by a substantial outer diameter of 47 mm, an increased width profile of 22.2 mm, and larger rolling elements. This reinforced internal architecture substantially boosts both dynamic and static load ratings compared to standard light-series counterparts such as the 5203.
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Technical & Engineering Review: DKFL 5303 2RS C3 (17x47x22.2 mm) Heavy-Duty Double-Row Angular Contact Ball Bearing with Dual Contact Rubber Seals & Elevated C3 Thermal Clearance
Engineered to withstand heavy bidirectional axial thrust, severe moment loads, and intense radial forces on 17 mm shafts
Engineering Introduction: DKFL 5303 2RS C3 Double-Row Heavy-Duty Bearing
The 5303 2RS C3 bearing from the renowned industrial brand DKFL represents one of the most rugged and heavy-duty double-row angular contact solutions available for 17 mm shaft assemblies. Unlike the lighter 52 series, this component belongs to the 53 Heavy Series (DIN 33xx), characterized by a substantial outer diameter of 47 mm, an increased width profile of 22.2 mm, and larger rolling elements. This reinforced internal architecture substantially boosts both dynamic and static load ratings compared to standard light-series counterparts such as the 5203.
Kinematically equivalent to a paired set of single-row 7303 angular contact bearings mounted in a back-to-back (DB) configuration, the 5303 2RS C3 effectively neutralizes simultaneous bidirectional axial thrust, severe radial loads, and overturning moments resulting from shaft deflection. Built from vacuum-degassed 100Cr6 bearing alloy and equipped with dual steel-reinforced rubber contact seals (2RS) and expanded internal clearance (C3), this premium component is exclusively distributed by Kamyar Gostar Iranian Co. (KGICO).
Technical Code & Suffix Breakdown: DKFL 5303 2RS C3
Identifies a heavy-duty double-row angular contact bearing with a wider profile and larger ball diameter, engineered for harsh mechanical shock loads and severe stresses.
Standard international metric designator defining a precision ground 17 mm inner bore diameter, machined to micro-tolerances for high-fit shaft journals.
Features sheet steel-reinforced Nitrile Butadiene Rubber (NBR) lip seals on both sides to retain factory lubricant and prevent particulate, fluid, and dust contamination.
Specifies radial internal clearance greater than Normal ($C3 > Normal$), compensating for high-temperature thermal shaft expansion and preventing ball pinching under high RPM.
Dimensional, Dynamic & Metallurgical Specifications
| Engineering Parameter | Value & Standard | Functional Significance & Advantage |
|---|---|---|
| Bore Diameter (d) | 17 mm | Ground to ISO 492 Normal/P6 standards for secure interference fits on driving shafts |
| Outside Diameter (D) | 47 mm | Heavy-series outer ring envelope provides exceptional resistance against housing deformation |
| Total Width (B) | 22.2 mm | Extended cross-section yields superior angular stability and high structural rigidity |
| Contact Angle ($\alpha$) | 30° (Divergent Array) | Maximizes the effective distance between pressure centers to resist tilting and bending moments |
| Raceway & Element Alloy | 100Cr6 High-Carbon Chrome Steel | Martensitic through-hardened (60–64 HRC) to deliver maximum contact fatigue resistance |
| Internal Radial Clearance | C3 (Expanded Internal Clearance) | Eliminates parasitic preloads caused by tight shaft fits and high running temperatures |
| Internal Lubrication | Extreme Pressure (EP) Synthetic Grease | 100% sealed-for-life, maintenance-free operation across temperature ranges from -30°C to +120°C |
Engineering Advantages & Competitive Strengths of DKFL 5303 2RS C3
1. Exceptional Heavy-Duty Dynamic Capacity
With an external diameter of 47 mm and 22.2 mm width, the 5303 accommodates larger steel balls than the 5203, drastically increasing radial dynamic load ratings and impact absorption on 17 mm shafts.
2. Thermal Seizure Prevention via C3 Clearance
High operational speeds generate shaft friction and temperature rise. The calibrated C3 clearance provides thermal expansion room, preventing rolling-element pinching, excessive friction, and motor overload.
3. Hermetic 2RS Dual-Lip Sealing
Steel-reinforced elastomer seals safeguard the internal grease pack against dynamic centrifugal fling-off, while acting as a reliable barrier against ambient moisture, machining coolants, and airborne dust.
4. Superfinished Raceways & Vibration Dampening
Manufactured to DKFL precision German standards, micro-honed raceways lower rolling resistance, decrease operational heat generation, and ensure quiet, vibration-free operation under heavy torque loads.
Primary Industrial Applications
- High-Pressure Centrifugal & Multistage Pumps: Handles substantial continuous impeller thrust loads and rapid pressure reversals on 17 mm shafts.
- High-RPM Electric Motors & Generators: Keeps motor shafts accurately centered, eliminating magnetic air-gap imbalances and high-speed vibration.
- Compact Industrial Gearboxes & Reducers: Provides rigid intermediate and input shaft support capable of withstanding heavy gear mesh reactions.
- Tensioner Pulleys, Timing Belts & Idler Drives: Excels in supporting cantilevered and overhung bending loads without premature flaking.
- Packaging Machinery, Automated Conveyors & Textile Equipment: Delivers long-term maintenance-free operation in 24/7 industrial production environments.
Engineering Mounting & Handling Guidelines
This 2RS bearing is factory-filled with precision synthetic grease. Never attempt to remove the contact seals, inject non-compatible greases, or wash the assembly with solvents, thinner, or diesel fuels.
- Symmetric Press-Fitting: When installing onto a 17 mm shaft journal, apply press forces strictly to the inner ring face using a calibrated mounting tool. Never transmit pressing loads through the outer ring or balls, as this results in brinelling marks and immediate bearing destruction.
- Thermal Expansion Mounting: When using an induction bearing heater, limit the temperature strictly to 100°C (212°F) to protect the NBR elastomer seals and avoid grease separation. Never use an open flame torch.
- Fit Tolerance Verification: To optimize C3 clearance behavior, shaft tolerances of j6 to k5 and housing tolerances of H7 are recommended to prevent excessive reduction of initial radial clearance.
- Maintenance-Free Design: As a factory-sealed unit, housing grease fittings or relubrication lines should be safely blanked off.
Guaranteed Authenticity via Kamyar Gostar Iranian (KGICO)
Employing counterfeit bearings or units lacking genuine C3 clearance in high-stress equipment frequently results in thermal runaway, shaft seizure, electric motor burnouts, and costly line stoppages. Securing genuine DKFL 5303 2RS C3 bearings is critical for maintaining plant reliability and peak mechanical uptime.
Kamyar Gostar Iranian Co. (KGICO), managed by Mr. Kazem Edalati, is the sole authorized representative for DKFL under international Certificate No. G_99260. KGICO guarantees 100% metallurgical authenticity, verified material certifications, competitive factory-direct pricing, and technical engineering support nationwide.
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